Morgan Hill, CA 95015 Frost Dates
Frost dates for Morgan Hill, CA, ZIP 95015
The last spring frost here typically falls around 05/03, about 248 days from today. The first fall frost typically arrives around 11/18, about 197 frost-free days later.
Zone 9b (25 to 30°F average annual minimum) comes from the USDA Plant Hardiness Zone Map; the frost dates above are the 1991-2020 normal at the nearest reporting NOAA station for Morgan Hill, not a forecast for this year.
What to do before the first frost
Zone 9b around Morgan Hill has about 12 weeks left before the first fall frost — that's the usual window to get a cold frame up if you want to keep harvesting past it.
Why 05/03 isn't a guarantee
05/03 is the middle of 30 years of NOAA records, not a promise. Plant by 04/07 and you're betting against frost in roughly 9 years out of 10. 06/05 is the safer bet, historically only a 1-in-10 chance of frost that late.
How Morgan Hill compares
At roughly 197 frost-free days, Morgan Hill places 18,587 of 40,283 ZIP codes in this dataset. Within CA, it ranks 2,259 of 2,555.
Learn more
local microclimates explains what one yard in Morgan Hill can differ from the 95015 normal, and zone vs. frost date explains why Zone 9b and Morgan Hill's frost date answer different questions.